similar to: Decoding for ambisonic : downmix support

The prospect of people actually putting B-format audio (via the panner or directly input) into Ogg/Vorbis brings an interesting challenge: What do we do with the audio after decoding it? The following sane options exist: A) Simply output the B-format audio B) Produce a downmix 1) Mono. 2) Stereo blumlein crossed pairs 3) Stereo UHJ 4) binaural C) Produce speaker feeds 1) Fully

Marc, Thanks for the comments. On Sat, May 28, 2016 at 5:50 PM, Marc Lavallée <marc at hacklava.net> wrote: > So, channels will stay uncoupled for Ambisonics? That would be great, > because considering how good Opus already is, I don't think that more > optimization is required, and it would put content creators at ease; > they often believe that any compression or channel

On Sat, 28 May 2016 16:21:33 -0700, Michael Graczyk <mgraczyk at google.com> wrote : > Hi Marc, Hi Micheal. > On Sat, May 28, 2016 at 10:44 AM, Marc Lavallée <marc at hacklava.net> > wrote: > > I subscribed because your discussion on the IETF draft ("Ambisonics > > in an Ogg Opus Container") was mentioned on the sursound list. > > Thanks for

Michael Graczyk wrote: ... > UHJ is an interesting way to preserve compatibility with non-ambisonic > playback systems. ... > If UHJ becomes popular in the future, we could > specify rules for encapsulating UHJ in Ogg. I guess it depends on how you define popular. The UHJ Discography lists over 270 UHJ-encoded records. This EXcludes over 450 releases by Nimbus Records. The UHJ

On Tue, 31 May 2016 09:41:37 -0700 Michael Graczyk <mgraczyk at google.com> wrote: > UHJ is an interesting way to preserve compatibility with non-ambisonic > playback systems. However, I have not seen it generalized to higher > orders. I expect that its popularity will decrease as HOA becomes more > and more common. If UHJ becomes popular in the future, we could > specify

On 3/22/07, Brian Willoughby <brianw@sounds.wa.com> wrote: ... > But to return to your question, exactly what kind of "support" are > you looking for? I wasn't looking for any particular support, but just to see what support was there (if any). ... > I do not believe that there is any need for code specifically > supporting Ambisonics. FLAC supports conversion to

"Gabriel I." wrote: > Greetings, > > I apologize if I posted this in the wrong list, I wasn't sure where to post > it, but seeing as the tags are called "vorbis comments" I thought vorbis, > rather than ogg-dev, would be the right choice. (actually, I'm not even a > developer anyway) Hi Gabriel, I doubt whether the Xiph community would promote a

Date: Mon, 10 Jul 2000 14:51:12 +0100 (BST) From: DG Malham <dgm2@york.ac.uk> To: vorbis-dev@xiph.org Cc: DG Malham <dgm2@york.ac.uk>, Rob Fletcher <rpf1@york.ac.uk> Subject: Re: [vorbis-dev] True surround sound for Ogg -- a proposal (fwd) In-Reply-To: <Pine.SGI.3.95L.1000710092216.9043693B-100000@turpin.york.ac.uk> Message-ID:

> I assume, somewhere, someone has a compendium of recommended hardware for ambisonics? Something to sanity check/inform equipment selections of someone building My First Ambisonics Rig? Not at all Monty. This is an important question and I am ashamed to say I can't point you to a good answer. In the meantime, have a look at Permananent Ambisonic Systems from

Brian Willoughby <brianw at sounds.wa.com> wrote: > On Jan 7, 2011, at 16:27, Declan Kelly wrote: ... >> As the human hearing can't really tell direction with lower >> frequencies, >> it's not as essential. This same shortcut is why most movie "surround >> sound" systems have only one sub bass channel. > > In this case, you have been misled

Richard Lee wrote: > But there is a caveat. Does Vorbis coupling preserve "phase" relations? Any references explaining this in simple detail? Sebastian : >"coupling" is a rather loose term in the sense that it doesn't exactly specify HOW it's done. It can be understood as the opposite of coding channels independently. Obviously there are many ways to do

Martin, I do not believe that there is any need for code specifically supporting Ambisonics. FLAC supports conversion to and from other audio formats which hold multiple channels. Ambisonics B-format involves channels WXYZ, C-format is UHJ or BHJ, G-Format can be any number of channels, but typically 5.1 on DVD. You can work with Ambisonic recordings by either using individual mono

This came out of the OggPCM discussion, but I think it needs to be addressed on a wider scale. Let's start here, 5 years ago.. http://lists.xiph.org/pipermail/vorbis-dev/2000-July/009513.html (I included this email, below) I emailed David (author of that email) and asked him to join this list. I'm thinking, as I look at the problem, that surround sound needs to be defined _outside_

On Sun, 24 Aug 2003, smoerk wrote: > there are different channel profiles for 5.1: > L R C LFE Ls Rs (DVD) > L R Ls Rs C LFE > L C R Ls Rs LFE (Film) I don't see why you need more than one of the above formats. It's not like you can't decide to put the LFE channel into "input 3" or "input 5" or whatever set of inputs your sending it to, depending on

>Yesterday I have finished writing the ambisonic pan filter for oggenc. May I ask what this "pan filter" is? I made some tentative suggestions for coupling Ambisonic B-format in a post "Vorbis Ambisonic coupling" on 4feb07 I gather from the last monthly meeting, that some of you, including Monty, had problems with the phase behaviour of B-format. Would anyone like a

Curt Sampson wrote: > On Sun, 24 Aug 2003, smoerk wrote: > > >>there are different channel profiles for 5.1: >>L R C LFE Ls Rs (DVD) >>L R Ls Rs C LFE >>L C R Ls Rs LFE (Film) > > > I don't see why you need more than one of the above formats. It's not > like you can't decide to put the LFE channel into "input 3" or "input

Josh Coalson wrote: > --- smoerk <smoerk@gmx.de> wrote: > >>i didn't find anything about tagging flac files as surround files. i >>think there should some possibility to tell the player how to play a >>multi-channel file (how to map the different channels to the speakers >>or if there some decode is needed, like for ambisonic files). > > > it

Hi everyone, Over the last two weeks or so, I've been thinking about how to add surround sound to Ogg -- and more than that, to do it in the best way possible. With this in mind, I started considering using Ambisonic surround sound. The advantages of this format are considerable: a) It was developed in the early to mid '70s, so the patents should be expired by now.

Hi, I have posted this three times to the flac-dev, vorbis-dev, and ogg-dev mailing lists. I wanted to see what code there was currently to support Ambisonics. So I downloaded the code from the xiph download page for libogg-1.1.3, libvorbis-1.1.2, vorbis-tools-1.1.1 and flac-1.1.4, but wasn't able to find anything. If it exists then I missed it, so could somebody please point me to it.

Where can I find the Header file or whatever which specifies the "Mapping" flag. In feb - apr 2007, there was a lot of discussion about Ambisonics and Monty kindly stated that Mapping = 1 ; Denotes and Ambisonic file as opposed to = 0 which is 1 speaker/ 1 channel Has this been written explicitly into the standard? Which standard should I be looking at?